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The expansion rate of the universe is determined by the mass of the things in the universe and the strength of the gravitational force. The universe would start to slow down if some new form of matter were to intervene which incresed the over all mass of the universe, or if there's some property of gravity that we don't know of, where at some threshold it actually becomes stronger.
What else can I help you with?
What is an accelerating universe?
An accelerating universe is a theory which describes and seeks to explain the increasing rate of the expansion of the universe.
How do you calculate dark energy?
Cosmological red-shift tells us that the space within our Universe is expanding. It is NOT that the matter within our Universe exploded; rather, SPACE ITSELF is growing bigger. Until about 1995, nobody knew of any entity, other than gravity, in our Universe that could alter the rate of expansion -- and gravity could only slow down this rate. The question was how much was gravity slowing this expansion. Several researchers worked to resolve this question. When Saul Parlemutter first calculated that the rate of expansion had actually increased over time (we're talking billion of years, mind you), he was sure he had made a dreadful mistake, and diligently searched for his error. After much effort, he finally concluded he had NOT made a mistake, and that the rate of expansion of the space in our Universe really IS increasing. So what IS the entity that is causing the rate of expansion to increase? We have NO IDEA!! That's why it's been given the name "dark energy." We know it's there because we can see its effects, but (for now) we don't know what it is. So how do we "calculate" dark energy? We simply compare the change in the rate of expansion that we SHOULD see (ie, what we would expect if dark energy didn't exist) -- and this rate should be very close to zero -- with the change that we do see. The difference is the amount of dark energy in our Universe.
Does dark energy affect the size of a universe?
Dark energy is thought to be the dominant force driving the accelerated expansion of the universe. Therefore, it does affect the size of the universe by causing it to expand at an accelerating rate. This expansion is causing galaxies to move away from each other at increasing speeds.
Why is the universe expanding and what force is it expanding into is it anti gravity?
The initial expansion of the universe was caused by the Big Bang's explosion of matter. Just as explosions here on earth cause expansion, so it was then. The math today, however, shows that the universe should be compressing again, as the energy lost over time would then be overridden by gravitational forces pulling everything back together. I'm sorry to say there's no such thing in our universe as anti-gravity, though. The universe's fate is generally accepted to be expansion forever at an ever slowing rate. To answer as to why this occurs, dark energy and dark matter are the forces at work - not anti-gravity.
What supports the presence of dark energy?
The evidence that we live in an expanding, and not a static,Universe is as solid as the evidence that we live in on a round, and not a flat,planet. Gravity is the only force we know of that could slow down "Hubble" Expansion but, for many decades, we were unable to calculate how rapidly this slow-down of Hubble Expansion was occurring. It was QUITE a shock when we found that, over time, the rate of expansion was INCREASING over time. Again, this fact is as irrefutable as the fact thatour Earth is going around our Sun. Since we "define" dark energy as "whatever it is that is causing the rate of Hubble Expansion to increase over time," the fact that the rate is increasing is all the support that is needed.
What forces cause this expansion?
The expansion of the universe is primarily driven by dark energy, a mysterious force that permeates space and causes it to stretch at an accelerating rate. This expansion is also influenced by the distribution of matter and energy throughout the universe, which determines the overall shape and evolution of the cosmos.
What is accelerating universe?
An accelerating universe is a theory which describes and seeks to explain the increasing rate of the expansion of the universe.
What is an accelerating universe?
An accelerating universe is a theory which describes and seeks to explain the increasing rate of the expansion of the universe.
How fast is the expansion of the edge of the universe occurring?
The expansion of the edge of the universe is happening at a rate of about 46 miles per second per megaparsec.
What is the rate of expansion of the universe in terms of the Hubble constant, which is approximately 70 km per second per megaparsec?
The rate of expansion of the universe is measured by the Hubble constant, which is around 70 kilometers per second per megaparsec.
What is the significance of the Hubble radius in understanding the expansion of the universe?
The Hubble radius is important in understanding the expansion of the universe because it represents the distance at which objects are receding from us faster than the speed of light due to the expansion of space. This boundary helps us determine the rate of expansion and the age of the universe.
What is causing the acceleration of the universe's expansion?
The acceleration of the universe's expansion is believed to be caused by a mysterious force called dark energy. This force is thought to counteract the gravitational pull of matter, causing the universe to expand at an increasing rate.
Does everything get warmer due to the increase in the rate of expansion of the universe because time is happening faster?
The increase in the rate of expansion of the universe does not directly cause everything to get warmer. It leads to a decrease in the density of matter and energy in the universe, which can have temperature implications for certain systems over vast cosmic timescales. Additionally, time dilation does not cause things to become warmer - it affects the perception of time passing based on relative motion or gravity but does not directly impact temperature.
What is the significance of the Hubble sphere in the context of cosmology and the expansion of the universe?
The Hubble sphere is a boundary in the universe beyond which objects are receding from us faster than the speed of light due to the expansion of the universe. It marks the limit of what we can observe. This concept is significant in cosmology as it helps us understand the rate of expansion and the large-scale structure of the universe.
What is most of the universe made of?
About 5% of our Universe consists of baryonic matter; ie, stuff we fully understand. Our Universe also contains about four times more mass in some form we DON'T understand, and that's why we call it "dark matter." And about 75% of the energy of the Universe consists of something that is causing the rate of expansion of our Universe to speed up. It can't be something with mass, because mass would cause the rate of expansion to slow down. So it has be some form of energy we just don't understand -- so, for now, we simply call it "dark energy." These two entities have nothing whatsoever in common other than the first word in the description we humans have given to them.
What does knowing the rate at which the universe is expanding tell astronomers about the big bang?
If the rate of expansion were constant then astronomers could look at the current location of galaxies and, "by running the clock backwards", work out when they would have all been at one position.
What forces causes the expansion?
The expansion of the universe is primarily driven by dark energy, a mysterious force that is causing the rate of expansion to accelerate. Gravity, the attractive force between objects with mass, also plays a role in shaping the large-scale structure of the universe.
